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www.linuxuprising.com
| | wittchen.io
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| | Sometimes we need to run specific program with a concrete version of JVM. We can also work with Java 7, but we want to try Java 8. In such cases, we can have installed both Java 7 and 8 on our system and easily switch between them. In order to show current java version, we can simply type: java -version in terminal. On my computer I received the following response:
| | www.webupd8.org
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| | Install Oracle Java 9 In Ubuntu, Linux Mint Or Debian Via PPA Repository [JDK9] ~ Ubuntu / Linux blog
| | www.optaplanner.org
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| | Java 11 was released some time ago, although the majority of developers stay on Java 8. Let's see which one of them is faster for OptaPlanner. The best way to find out is of course running ...
| | doomlab.github.io
17.9 parsecs away

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| An installation guide taken from formr documentation and modified to include more details for those who need it. These installation instructions are provided for Ubuntu 18.04; however, they could be modified for other systems. The original instructions suggest Debian 9, but I found this much easier on Ubuntu. I have now used both Digital Ocean and Amazon Lightsail for this installation. I don't think the product matters, but the size of the machine is likely something you should focus on.